Dirty volume control pot?
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I think it is the noise from the MDAC as it switches in/out resistors. I know the Rowland Synergy also had this effect. I had the 380 and have the 32 and using balanced connections, can barely hear it when I put my ear right up to the ribbon tweeters in my Piegas. But it's so quiet that it took quite a few turns up and down to ascertain its existence. Do you have the same noise from both RCA and XLR outputs and it out loud?
This is how it should be, this is the way how you're volume
control is build in you're pre-amp it sounds a little like high pithsing (wistle like) sound.
Check with you're Mark Levinson dealer, and let me now.
The T2 from Treshold has when you turn the volume loud klicking sound this is also the way its buid.
By the way a ML380s does not have a pot meter!!!!